<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <table border="1" width="500" height="300" align="center">
        <caption>表头</caption>
        <tr>
            <td colspan="2">dog</td>
            <td>photos</td>
            <!-- <td>2</td> -->
        </tr>
        <tr>
            <td rowspan="2">cat</td>
            <td>blank</td>
            <td>2</td>
        </tr>
        <tr>
            <td></td>
            <td></td>
            <td></td>
        </tr>
    </table>
</body>

</html>